icon on taskbar

Hi guys, I know I can customize the icon of a libreoffice document. However, the icon does not remain customized on the taskbar. Is there any way to fix this?

image description

I have a system with MySQL (Backend) and Libreofice Version: (Front-end). The database is directly connected to Libreoffice (native MySQL). OS: Linux Mint 20

You want to configure icons in a (unidentified flavour) Linux Mint taskbar? Doesn’t sound like a LibreOffice question. Does this Averagelinuxuser page help? If so, then please close this as off-topic